The Thule 593 Wheel On Bike Wheel Carrier fits all aftermarket roof rack bars from Thule and Yakima, as well as the Thule Xsporter truck rack and Thule Ride On car rack adapter. Don't worry about spinning your wheel while it's up on the roof. The Thule Wheel On features an anti-spin design that does away with making adjustments or using loose straps that flap in the wind. Plus, when not in use the Wheel On folds down for better clearance and safety.